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Chinese Journal of Applied Ecology ›› 2003, Vol. ›› Issue (8): 1265-1268.

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NO3--N leaching and distribution in soil profile in dry highland of Loess Plateau under long-term fertilization

DANG Tinghui1,2, GUO Shengli1, FAN Jun1, HAO Mingde 1   

  1. 1. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, China;
    2. Institute of Soil and Water Conservation, Northwest Science Technology University of Agriculture and Forestry, Yangling 712100, China
  • Received:2001-09-24 Revised:2002-04-08

Abstract: The NO3--N accumulation and distribution in soil profile of Loess Plateau dry highland were studied by long term field trials. The results showed that NO3--N was accumulated in the soil profile under N fertilization. Application of Pfertilizer or organic manure reduced the NO3--N content and its leaching depth in the soil profile. The deepest depth of NO3--N accumulation was 120～200 cm under N treatment, and the peak of the accumulation was the highest in NPMtreatment, with the depth of 60～120 cm. The NO3--N accumulation depth was 80～140 cm for NP. Without nitrogen application, there was no evident accumulation of NO3--N in soil profile. The more nitrogen used, the more NO3--N accumulated in soil profile. Under the same nitrogen application rate, NO3--N accumulation might decrease with increasing Papplication.

Key words: Long term fertilization, NO3--N distribution pattern, Loess Plateau dry highland

CLC Number: